Iowa Code Title VI. Human Services [Chs. 216-255A] § 252D.18B. Irregular income

When payment of income is irregular, and an order for immediate or mandatory income withholding has been entered by child support services or the district court, the income payor shall withhold income equal to the total that would have been withheld had there been regular monthly income. The amounts withheld shall not exceed the amounts specified in 15 U.S.C. § 1673(b). For the purposes of this section, an income source is irregular when there are periods in excess of one month during which the income payor makes no payment to the obligor and the periods are not the result of termination or suspension of employment.